Generally keep it in my head, and I often note changes in my log for historic reference.
I also note bodyweight in my training notes, so I can skim through chronologically and glance at bodyweight, date, and what my strength on things looked like - that alone usually can help ballpark when I was approximately on X.
I guess it depends on what you need in your tracking. Like is this for pre-planning a prep, so you make sure you start X or drop Y by a certain time, or are you trying to corroborate things like cycle notes/impressions/side effects/performance for retrospective analysis? Because if you are just planning, Xcel or pen and paper should be plenty. Or an electronic calendar on your phone to alert you to start whatever phase.
But also, if you are not locked into some kind of contest preparation, you should be flexible with your anabolic course - don’t up the dose if things are still progressing, and bail out or drop things whenever you need to. Don’t marry yourself to a pre-made outline, because the body doesn’t work that way. That is the hardest part about a prep, trying to get your body & life to line up with the arbitrary contest date.
